bus: mhi: core: Fix some error return code

Fix to return negative error code from the error handling case
instead of 0 in mhi_init_dev_ctxt() and mhi_driver_probe().

Fixes: 3000f85b ("bus: mhi: core: Add support for basic PM operations")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Link: https://lore.kernel.org/r/20200509075654.175002-1-weiyongjun1@huawei.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>